I have no idea what 'nox' is but are you using the SDK downloaded from here?
B4A includes all the features needed to quickly develop any type of Android app. B4A is used by tens of thousands of developers from all over the world, including companies such as NASA, HP, IBM and others.
www.b4x.com
If not do, and use 7-Zip, not File Explorer to unzip the archives as File Explorer may mangle the folder structure. Check the folder structure afterward as shown.